JMA02P003 262 270 Main Street Development Stormwater Management Report

Proposed Flows NOAA10 24-hr D 2-Year-Future Rainfall=4.04" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 5/26/2026 HydroCAD® 10.20-8a Sampler s/n S05110 © 2025 HydroCAD Software Solutions LLC This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and educational use ONLY. For actual design or modeling applications you MUST use a full version of HydroCAD which may be purchased at www.hydrocad.net. Full programs also include complete technical support,training materials, and additional features which are essential for actual design work. Hydrograph for Subcatchment 1S: Proposed Impervious Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 47.00 4.04 3.81 0.00 1.00 0.05 0.00 0.00 48.00 4.04 3.81 0.00 2.00 0.11 0.02 0.01 49.00 4.04 3.81 0.00 3.00 0.19 0.06 0.02 50.00 4.04 3.81 0.00 4.00 0.26 0.12 0.02 51.00 4.04 3.81 0.00 5.00 0.35 0.19 0.03 52.00 4.04 3.81 0.00 6.00 0.45 0.27 0.03 53.00 4.04 3.81 0.00 7.00 0.56 0.37 0.03 54.00 4.04 3.81 0.00 8.00 0.67 0.48 0.04 55.00 4.04 3.81 0.00 9.00 0.80 0.59 0.04 56.00 4.04 3.81 0.00 10.00 0.97 0.76 0.06 57.00 4.04 3.81 0.00 11.00 1.20 0.98 0.10 58.00 4.04 3.81 0.00 12.00 1.91 1.69 0.90 59.00 4.04 3.81 0.00 13.00 2.84 2.61 0.10 60.00 4.04 3.81 0.00 14.00 3.07 2.84 0.06 61.00 4.04 3.81 0.00 15.00 3.24 3.01 0.05 62.00 4.04 3.81 0.00 16.00 3.37 3.14 0.04 63.00 4.04 3.81 0.00 17.00 3.48 3.25 0.04 64.00 4.04 3.81 0.00 18.00 3.59 3.36 0.03 65.00 4.04 3.81 0.00 19.00 3.69 3.45 0.03 66.00 4.04 3.81 0.00 20.00 3.78 3.54 0.03 67.00

0 18.00 3.59 3.36 0.03 65.00 4.04 3.81 0.00 19.00 3.69 3.45 0.03 66.00 4.04 3.81 0.00 20.00 3.78 3.54 0.03 67.00 4.04 3.81 0.00 21.00 3.85 3.62 0.02 68.00 4.04 3.81 0.00 22.00 3.93 3.69 0.02 69.00 4.04 3.81 0.00 23.00 3.99 3.75 0.02 70.00 4.04 3.81 0.00 24.00 4.04 3.81 0.01 71.00 4.04 3.81 0.00 25.00 4.04 3.81 0.00 72.00 4.04 3.81 0.00 26.00 4.04 3.81 0.00 27.00 4.04 3.81 0.00 28.00 4.04 3.81 0.00 29.00 4.04 3.81 0.00 30.00 4.04 3.81 0.00 31.00 4.04 3.81 0.00 32.00 4.04 3.81 0.00 33.00 4.04 3.81 0.00 34.00 4.04 3.81 0.00 35.00 4.04 3.81 0.00 36.00 4.04 3.81 0.00 37.00 4.04 3.81 0.00 38.00 4.04 3.81 0.00 39.00 4.04 3.81 0.00 40.00 4.04 3.81 0.00 41.00 4.04 3.81 0.00 42.00 4.04 3.81 0.00 43.00 4.04 3.81 0.00 44.00 4.04 3.81 0.00 45.00 4.04 3.81 0.00 46.00 4.04 3.81 0.00

Proposed Flows NOAA10 24-hr D 2-Year-Future Rainfall=4.04" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 5/26/2026 HydroCAD® 10.20-8a Sampler s/n S05110 © 2025 HydroCAD Software Solutions LLC This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and educational use ONLY. For actual design or modeling applications you MUST use a full version of HydroCAD which may be purchased at www.hydrocad.net. Full programs also include complete technical support,training materials, and additional features which are essential for actual design work. Summary for Subcatchment 3S: Proposed Pervious Runoff = 0.05 cfs @ 12.07 hrs, Volume= 123 cf, Depth= 1.63" Routed to Pond 5P : Porous Pavement B Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA10 24-hr D 2-Year-Future Rainfall=4.04" Area (sf) CN Description 907 74 >75% Grass cover, Good, HSG C 907 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment 3S: Proposed Pervious Hydrograph Runoff 0.05 0.05 cfs 0.045 NOAA10 24-hr D 2-Year-Future Rainfall=4.04" 0.04 Runoff Area=907 sf 0.035 Runoff Volume=123 cf Runoff Depth=1.63" Flow (cfs) 0.03

Runoff Volume=123 cf Runoff Depth=1.63" Flow (cfs) 0.03 Tc=1.0 min 0.025 CN=74 0.02 0.015 0.01 0.005 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)

Proposed Flows NOAA10 24-hr D 2-Year-Future Rainfall=4.04" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 5/26/2026 HydroCAD® 10.20-8a Sampler s/n S05110 © 2025 HydroCAD Software Solutions LLC This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and educational use ONLY. For actual design or modeling applications you MUST use a full version of HydroCAD which may be purchased at www.hydrocad.net. Full programs also include complete technical support,training materials, and additional features which are essential for actual design work. Hydrograph for Subcatchment 3S: Proposed Pervious Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 47.00 4.04 1.63 0.00 1.00 0.05 0.00 0.00 48.00 4.04 1.63 0.00 2.00 0.11 0.00 0.00 49.00 4.04 1.63 0.00 3.00 0.19 0.00 0.00 50.00 4.04 1.63 0.00 4.00 0.26 0.00 0.00 51.00 4.04 1.63 0.00 5.00 0.35 0.00 0.00 52.00 4.04 1.63 0.00 6.00 0.45 0.00 0.00 53.00 4.04 1.63 0.00 7.00 0.56 0.00 0.00 54.00 4.04 1.63 0.00 8.00 0.67 0.00 0.00 55.00 4.04 1.63 0.00 9.00 0.80 0.00 0.00 56.00 4.04 1.63 0.00 10.00 0.97 0.02 0.00 57.00 4.04 1.63 0.00 11.00 1.20 0.06 0.00 58.00 4.04 1.63 0.00 12.00 1.91 0.31 0.03 59.00 4.04 1.63 0.00 13.00 2.84 0.81 0.00 60.00 4.04 1.63 0.00 14.00 3.07 0.95 0.00 61.00 4.04 1.63 0.00 15.00 3.24 1.07 0.00 62.00 4.04 1.63 0.00 16.00 3.37 1.15 0.00 63.00 4.04 1.63 0.00 17.00 3.48 1.23 0.00 64.00 4.04 1.63 0.00 18.00 3.59 1.30 0.00 65.00 4.04 1.63 0.00 19.00 3.69 1.37 0.00 66.00 4.04

48 1.23 0.00 64.00 4.04 1.63 0.00 18.00 3.59 1.30 0.00 65.00 4.04 1.63 0.00 19.00 3.69 1.37 0.00 66.00 4.04 1.63 0.00 20.00 3.78 1.43 0.00 67.00 4.04 1.63 0.00 21.00 3.85 1.49 0.00 68.00 4.04 1.63 0.00 22.00 3.93 1.54 0.00 69.00 4.04 1.63 0.00 23.00 3.99 1.59 0.00 70.00 4.04 1.63 0.00 24.00 4.04 1.63 0.00 71.00 4.04 1.63 0.00 25.00 4.04 1.63 0.00 72.00 4.04 1.63 0.00 26.00 4.04 1.63 0.00 27.00 4.04 1.63 0.00 28.00 4.04 1.63 0.00 29.00 4.04 1.63 0.00 30.00 4.04 1.63 0.00 31.00 4.04 1.63 0.00 32.00 4.04 1.63 0.00 33.00 4.04 1.63 0.00 34.00 4.04 1.63 0.00 35.00 4.04 1.63 0.00 36.00 4.04 1.63 0.00 37.00 4.04 1.63 0.00 38.00 4.04 1.63 0.00 39.00 4.04 1.63 0.00 40.00 4.04 1.63 0.00 41.00 4.04 1.63 0.00 42.00 4.04 1.63 0.00 43.00 4.04 1.63 0.00 44.00 4.04 1.63 0.00 45.00 4.04 1.63 0.00 46.00 4.04 1.63 0.00

Proposed Flows NOAA10 24-hr D 2-Year-Future Rainfall=4.04" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 5/26/2026 HydroCAD® 10.20-8a Sampler s/n S05110 © 2025 HydroCAD Software Solutions LLC This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and educational use ONLY. For actual design or modeling applications you MUST use a full version of HydroCAD which may be purchased at www.hydrocad.net. Full programs also include complete technical support,training materials, and additional features which are essential for actual design work. Summary for Subcatchment 4S: Proposed Impervious Runoff = 1.62 cfs @ 12.06 hrs, Volume= 4,876 cf, Depth= 3.81" Routed to Pond 5P : Porous Pavement B Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA10 24-hr D 2-Year-Future Rainfall=4.04" Area (sf) CN Description 15,377 98 Paved parking, HSG C 15,377 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment 4S: Proposed Impervious Hydrograph Runoff 1.62 cfs NOAA10 24-hr D 2-Year-Future Rainfall=4.04" Runoff Area=15,377 sf Runoff Volume=4,876 cf Runoff Depth=3.81" Flow (cfs) 1

Runoff Depth=3.81" Flow (cfs) 1 Tc=1.0 min CN=98 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)

Proposed Flows NOAA10 24-hr D 2-Year-Future Rainfall=4.04" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 5/26/2026 HydroCAD® 10.20-8a Sampler s/n S05110 © 2025 HydroCAD Software Solutions LLC This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and educational use ONLY. For actual design or modeling applications you MUST use a full version of HydroCAD which may be purchased at www.hydrocad.net. Full programs also include complete technical support,training materials, and additional features which are essential for actual design work. Hydrograph for Subcatchment 4S: Proposed Impervious Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 47.00 4.04 3.81 0.00 1.00 0.05 0.00 0.00 48.00 4.04 3.81 0.00 2.00 0.11 0.02 0.01 49.00 4.04 3.81 0.00 3.00 0.19 0.06 0.02 50.00 4.04 3.81 0.00 4.00 0.26 0.12 0.02 51.00 4.04 3.81 0.00 5.00 0.35 0.19 0.03 52.00 4.04 3.81 0.00 6.00 0.45 0.27 0.03 53.00 4.04 3.81 0.00 7.00 0.56 0.37 0.04 54.00 4.04 3.81 0.00 8.00 0.67 0.48 0.04 55.00 4.04 3.81 0.00 9.00 0.80 0.59 0.05 56.00 4.04 3.81 0.00 10.00 0.97 0.76 0.06 57.00 4.04 3.81 0.00 11.00 1.20 0.98 0.11 58.00 4.04 3.81 0.00 12.00 1.91 1.69 1.00 59.00 4.04 3.81 0.00 13.00 2.84 2.61 0.11 60.00 4.04 3.81 0.00 14.00 3.07 2.84 0.06 61.00 4.04 3.81 0.00 15.00 3.24 3.01 0.06 62.00 4.04 3.81 0.00 16.00 3.37 3.14 0.04 63.00 4.04 3.81 0.00 17.00 3.48 3.25 0.04 64.00 4.04 3.81 0.00 18.00 3.59 3.36 0.04 65.00 4.04 3.81 0.00 19.00 3.69 3.45 0.03 66.00 4.04 3.81 0.00 20.00 3.78 3.54 0.03 67.00

0 18.00 3.59 3.36 0.04 65.00 4.04 3.81 0.00 19.00 3.69 3.45 0.03 66.00 4.04 3.81 0.00 20.00 3.78 3.54 0.03 67.00 4.04 3.81 0.00 21.00 3.85 3.62 0.03 68.00 4.04 3.81 0.00 22.00 3.93 3.69 0.02 69.00 4.04 3.81 0.00 23.00 3.99 3.75 0.02 70.00 4.04 3.81 0.00 24.00 4.04 3.81 0.01 71.00 4.04 3.81 0.00 25.00 4.04 3.81 0.00 72.00 4.04 3.81 0.00 26.00 4.04 3.81 0.00 27.00 4.04 3.81 0.00 28.00 4.04 3.81 0.00 29.00 4.04 3.81 0.00 30.00 4.04 3.81 0.00 31.00 4.04 3.81 0.00 32.00 4.04 3.81 0.00 33.00 4.04 3.81 0.00 34.00 4.04 3.81 0.00 35.00 4.04 3.81 0.00 36.00 4.04 3.81 0.00 37.00 4.04 3.81 0.00 38.00 4.04 3.81 0.00 39.00 4.04 3.81 0.00 40.00 4.04 3.81 0.00 41.00 4.04 3.81 0.00 42.00 4.04 3.81 0.00 43.00 4.04 3.81 0.00 44.00 4.04 3.81 0.00 45.00 4.04 3.81 0.00 46.00 4.04 3.81 0.00